#include <bits/stdc++.h>
using namespace std;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int N;
    cin >> N;
    vector<int> dp(N * 1000 + 1, N * 1005);
    vector<int> dp_new(N * 1000 + 1, N * 1005);
    dp[0] = 0;
    for (int i = 0; i < N; ++i){
        int a, b;
        cin >> a >> b;
        for (int t = 0; t <= N * 1000; ++t){
            if (t + a < dp_new.size()) dp_new[t + a] = min(dp_new[t + a], dp[t]);
            dp_new[t] = min(dp_new[t], dp[t] + b);
        }
        swap(dp_new, dp);
        dp_new.assign(N * 1000 + 1, N * 1005);
    }
    int ans = N * 1005;
    for (int i = 0; i < dp.size(); ++i){
        ans = min(ans, max(i, dp[i]));
    }
    cout << ans << endl;
    return 0;
}